Add SDKVersion (#203)

Author: wata727

plugin/host2plugin/client.go

@@ -81,6 +81,15 @@ func (c *GRPCClient) VersionConstraints() (version.Constraints, error) {
 	return version.NewConstraint(resp.Constraint)
 }
 
+// SDKVersion returns the SDK version.
+func (c *GRPCClient) SDKVersion() (*version.Version, error) {
+	resp, err := c.client.GetSDKVersion(context.Background(), &proto.GetSDKVersion_Request{})
+	if err != nil {
+		return nil, fromproto.Error(err)
+	}
+	return version.NewVersion(resp.Version)
+}
+
 // ConfigSchema fetches the config schema from a plugin.
 func (c *GRPCClient) ConfigSchema() (*hclext.BodySchema, error) {
 	resp, err := c.client.GetConfigSchema(context.Background(), &proto.GetConfigSchema_Request{})

plugin/host2plugin/host2plugin_test.go

@@ -254,6 +254,19 @@ func TestVersionConstraints(t *testing.T) {
 	}
 }
 
+func TestSDKVersion(t *testing.T) {
+	client := startTestGRPCPluginServer(t, newMockRuleSet("test_ruleset", "0.1.0", mockRuleSetImpl{}))
+
+	got, err := client.SDKVersion()
+	if err != nil {
+		t.Fatalf("failed to call SDKVersion: %s", err)
+	}
+
+	if got.String() != SDKVersion {
+		t.Errorf("want: %s, got: %s", SDKVersion, got)
+	}
+}
+
 func TestConfigSchema(t *testing.T) {
 	// default error check helper
 	neverHappend := func(err error) bool { return err != nil }

plugin/host2plugin/plugin.go

@@ -9,6 +9,9 @@ import (
 	"google.golang.org/grpc"
 )
 
+// SDKVersion is the SDK version.
+const SDKVersion = "0.13.0"
+
 // handShakeConfig is used for UX. ProcotolVersion will be updated by incompatible changes.
 var handshakeConfig = plugin.HandshakeConfig{
 	ProtocolVersion:  11,

plugin/host2plugin/server.go

@@ -68,6 +68,11 @@ func (s *GRPCServer) GetVersionConstraint(ctx context.Context, req *proto.GetVer
 	return &proto.GetVersionConstraint_Response{Constraint: s.impl.VersionConstraint()}, nil
 }
 
+// GetSDKVersion returns the SDK version.
+func (s *GRPCServer) GetSDKVersion(ctx context.Context, req *proto.GetSDKVersion_Request) (*proto.GetSDKVersion_Response, error) {
+	return &proto.GetSDKVersion_Response{Version: SDKVersion}, nil
+}
+
 // GetConfigSchema returns the config schema of the plugin.
 func (s *GRPCServer) GetConfigSchema(ctx context.Context, req *proto.GetConfigSchema_Request) (*proto.GetConfigSchema_Response, error) {
 	return &proto.GetConfigSchema_Response{Schema: toproto.BodySchema(s.impl.ConfigSchema())}, nil